Grimracer Well-Known Member Joined Dec 27, 2001 Messages 9,502 Jun 26, 2023 #1 Looking for the charts for a speed master gauge Thanks
Terry Keeley Well-Known Member Supporting Member Joined Jul 24, 2002 Messages 7,126 Jun 26, 2023 #2 Indicator movement x 360 / # degrees = pitch My "standard" is to measure 15* of the LE and 15* of the TE at 75% from the C/L. For example the LE on some 1667's I just checked was: 0.180" x 360 / 15 = 4.32" I've found that LE pitch will tell you pretty close what speed the prop is capable of, with zero slip it's: pitch in inches x rpm / 1057 For that 1667 it's: 4.32 x 24,000 / 1057 = 98.1 mph. If you have a clean running boat 15% slip works well so 98.1 x 0.85 = 83 mph. I checked this audio tach app with the data logger on my SAW boat and it's surprisingly accurate: Engine RPM My 90 boat with the above prop ran 82 in this vid with the Sky RC GPS. TMI! Last edited: Jun 26, 2023
Indicator movement x 360 / # degrees = pitch My "standard" is to measure 15* of the LE and 15* of the TE at 75% from the C/L. For example the LE on some 1667's I just checked was: 0.180" x 360 / 15 = 4.32" I've found that LE pitch will tell you pretty close what speed the prop is capable of, with zero slip it's: pitch in inches x rpm / 1057 For that 1667 it's: 4.32 x 24,000 / 1057 = 98.1 mph. If you have a clean running boat 15% slip works well so 98.1 x 0.85 = 83 mph. I checked this audio tach app with the data logger on my SAW boat and it's surprisingly accurate: Engine RPM My 90 boat with the above prop ran 82 in this vid with the Sky RC GPS. TMI!
Grimracer Well-Known Member Joined Dec 27, 2001 Messages 9,502 Jun 26, 2023 #3 I use a WOODs gauge.. BUT picked this Speedmaster in a buyout.. if the Speedmaster came with charts it would be good to get a set back with this gauge. Thanks for posting TK.. your info is invaluable to us all! Grim
I use a WOODs gauge.. BUT picked this Speedmaster in a buyout.. if the Speedmaster came with charts it would be good to get a set back with this gauge. Thanks for posting TK.. your info is invaluable to us all! Grim
Z Zimmerman Well-Known Member Supporting Member Joined Jul 21, 2003 Messages 287 Jul 4, 2023 #4 Hey Mike, Sorry for the late response. I have a Speedmaster gauge. I can text chart to you if you still need one, Rich
Hey Mike, Sorry for the late response. I have a Speedmaster gauge. I can text chart to you if you still need one, Rich
K K F Wheeler Well-Known Member Supporting Member Joined Apr 14, 2021 Messages 407 Jul 5, 2023 #5 I'm sure he does, Richard. Adds value to the gauge he has... He must be busy to not have replied by now. Ken
I'm sure he does, Richard. Adds value to the gauge he has... He must be busy to not have replied by now. Ken
Z Zimmerman Well-Known Member Supporting Member Joined Jul 21, 2003 Messages 287 Jul 5, 2023 #6 Hey Ken, If I get a chance later today I will post them here. Otherwise I will bring a set to the Wine Run. Rich
Hey Ken, If I get a chance later today I will post them here. Otherwise I will bring a set to the Wine Run. Rich
Grimracer Well-Known Member Joined Dec 27, 2001 Messages 9,502 Jul 5, 2023 #7 Zimmerman said: Hey Mike, Sorry for the late response. I have a Speedmaster gauge. I can text chart to you if you still need one, Rich Click to expand... Mr.Z.. yes in deed.. you can send to... [email protected] or text to 715-450-9889
Zimmerman said: Hey Mike, Sorry for the late response. I have a Speedmaster gauge. I can text chart to you if you still need one, Rich Click to expand... Mr.Z.. yes in deed.. you can send to... [email protected] or text to 715-450-9889
Z Zimmerman Well-Known Member Supporting Member Joined Jul 21, 2003 Messages 287 Jul 9, 2023 #8 Just got back in town and will send this week.